guys talking toss, there is no way a diagnosis machine can snese if the fuel pressure reg is naffed.

dont waste your time on a power boost valve, its a waste of time money and effort, the std fuel pressure regulators are adjustable, if the pressure is low then the fuel pump will be the cause unless someone has messed with the fuel reg already, if they have, then its a case of adjusting it up, but dont mess with it, you can make it run rich or lean.

if the diagnosis machine is reading a lean mix this is not due to the fuel reg, it will be the pump.
when my pump went, it worked still but pressure was very low and it ran like crap, fitted a upreated pump and it drove like a new car.

save yas money, a power boost valve is useless as you have a adjustable one already